Swing中使用AbstractListModel的大型虚拟列表

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public class VirtualListDemo extends JPanel {
    private static final int LIST_SIZE = 100000;

    public VirtualListDemo() {
        setLayout(new BorderLayout());

        MyListModel model = new MyListModel();
        JList list = new JList(model);
        list.setVisibleRowCount(20);
        add(new JScrollPane(list));
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("Virtual List Demo");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setSize(400, 400);
            frame.add(new VirtualListDemo());
            frame.setVisible(true);
        });
    }

    private static class MyListModel extends AbstractListModel {
        private final ArrayList<String> data = new ArrayList<>();

        public MyListModel() {
            for (int i = 0; i < LIST_SIZE; i++) {
                data.add("Item " + i);
            }
        }

        @Override
        public int getSize() {
            return data.size();
        }

        @Override
        public Object getElementAt(int index) {
            return data.get(index);
        }
    }
}